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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c38e5ece992a584bd068c303c7eb8a5d9b0c03a29c11e467b2a878f4b917cd' 
  AND token = 'briGtS4uFHeR0dOnh4aS1J/SomUV58p5LHSe2fJsQ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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