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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb19d5949f32fa6e1ab7b50f0b066824920396c58a7bbc3bc834b8b075de999a' 
  AND token = 'Df8VL1o53rxth2ovGcYB5dzJy6AQiNWyy4cyHhw3S34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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