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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e65556186a74a1c60644b05190d6466c1c00d317c084efef6438a833a71e7a6' 
  AND token = '/lZRakgu1NonyAr4R6BTMBmgKGgx/n8u8R6UUB/1YGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}