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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a93de43481d792255942f2139852ee63deb14405c706dc217ab1eaf467c62e' 
  AND token = 'Y8s3hrDxOvccjAgKPSpkSY2d/StXS7RN8FLMxmBFnNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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