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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610f7d79f71d8e9250f966c5f5b5c04d19dc40d2839c6210e1e75ec296c79faf' 
  AND token = 'T5gjs7kC2DNpJGrF/RB8+LgZZ6BZ/ZiA7PSr1UtDtYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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