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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca37d65d5b55089cd632738c669f4a73951aa655fc1cd30fe83a0b7b11f5da8' 
  AND token = 'A9Zs3p4fed97PstZ2LVupr680ADovuBqFwA2HVLRm1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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