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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d718288decc1cadb89b9ca2f7e5c04f4a69aaf9d48efe17ee572f16a506be9' 
  AND token = 'udMnoh+eFj6u0bq8n0zSneMPqQMPbOLFilmFC0sCZ7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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