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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b22e1a39e9639071e8bf6e6c9f171de0c58055edb2604e3ec550be9f84e8d91' 
  AND token = 'wL+Kwap6rbNT1ztwTMdMrdVjuidrjeoa11c7r3/iPNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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