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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7baf44c4d7624e0a9a7c6bb0da73a5cfe337833c2251ec78e00fe3b4cf84cb' 
  AND token = 'gyWiJb4NnilSuz48/4oH5aGVDF4rO0UiJCFs2VhQInU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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