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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b9451450ef5f74d5c50a88c45d3b2b1ad857d4756d1de54de48a1fa0028cf5' 
  AND token = 'jpqFDO/+z/F1bcL66ioFHFAfxA+lJNu9haKTySs9+Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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