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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940475ea39c07e2427794a9cd0375be0462610bd8a00ea189b763fa2c24e38be' 
  AND token = '/jJG4y/9piQj7MqHU2pKbvckf3SpIDTUETtelZr88hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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