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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740c862c6acb8bdd2367df85f2b2c6f4e6587e7809abab9bff51679e978c83c3' 
  AND token = 'oIRpmPY9vUKhY9GdOffnrg8i6gWA4luM/ca6MKaAGik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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