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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790b8ce77e7a64677f550e9734fb749af2fd2b3a6b962e68f93eb2b813e6c7b2' 
  AND token = 'wM9KaEtVFCPD+M4ztyBucG989IiJCdvAGO4efX7y9/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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