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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a5a3c0de8a81634a3bc30cc03fb869f6de2232a5c57c4130315f8b6067c1ec' 
  AND token = 'c98vMOqbqec/VmA2GyrweNQBew4pwU8LKqSZcKn+Cm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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