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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f702e341e23daf3c305526eb3bdc8c426e017557d2acf03edc1de33b74cbb48d' 
  AND token = 'NY++xTjF4dd9s3rpQVRhwALK6nl6UvmpdCNxfN6R6hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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