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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102d5457e1bb7fd5f1c8c31b03a28ce5f61d7eaacbf77adbed6d0ba9f5395216' 
  AND token = 'woe4VN79ukjIbE5rETUc4ovSPSlL//Q/c8KF4Y9QvlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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