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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e53b94300e66ef9ffdc98463e83437fd8af25919f1258859d000de76c68f85' 
  AND token = '02BaHQ0a59kZwflUfybgCCV4W5kOg3rq4GpUEdP7QKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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