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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c3e6ca81153730b83e2a557c9b90a110efa6a68dfa56653dfcb9b85b938b8a' 
  AND token = 'klam0+erkN7xzk6m70l4TzoY8D/38+etC5PGH4I4c3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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