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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fab819b368df91fc8c5b85e7b78c0b659e095ea5b60891e2574449e4209fb1' 
  AND token = '6uQqpTNucDva3tTPJMWyJTWJgr7jMYt1RsCe8GO8rZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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