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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bab5952f3d48447aeeb0b91ae9935820831cd1f1d3f3020f15e8fa01b8d2b19' 
  AND token = '7Rp7nmL8ZwIvRNmoaCkDfs3DAT90UaG5htFZs61U1cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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