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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4f2e22e1fff6590a7e823ed84f04c0fa3fde25213167e6dc58b79d5b88405a' 
  AND token = 'Wl0f/ipmBvk4gN5g9Gq00I80hpNiA6jZhnMJaByLCTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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