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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2c31e59579a2f9ae4b67cf3262e5d6f2a8878f1ab35a64218a9aacca2ca7f3' 
  AND token = 'KtjRIDwkZtL0oXc6wuxp0xBKYvffUOMveA9jjthj0fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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