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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbdced029847de574f1cc88f9a5594bf3b26d1836d676b9756bbc55a7400339' 
  AND token = 'qPemxFf2uk8SZTy4BRX+5T1ZNzdpa/rhqpi/Zt/+Nko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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