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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac09b3173a85d320c5120ae3ce9edd0a6caa7fba60a2c1c66e1d48605e3d7db9' 
  AND token = 'APYKZaFfWWSbjItIVVNGj6cs9WVYeLWgUwTHGEx0SKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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