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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89224f7ad6ce084a96073f29919ebb0067dba183baa9128a13fd433d95a1414b' 
  AND token = 'S84YOXYU9BA27vTqZEtelzX1wKYq1Zpowx1itN700UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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