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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48e96e60152c9d17edce324e68b5af7df4ed02a98aa5d0d7c006b7739f6d5b5' 
  AND token = 'U3IaecvL6fmZCNniFRS+h6I/BOnxZq2bzoH7RAthpug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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