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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43fe24b6ee0d825e4fbab0e1e6467c07d4dccc820ccd93e84bbfe29ac4d677f' 
  AND token = 'ViW9cLj6gQDBdNfIce1ilLcY/aWJNB3pGLzCyG+mmFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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