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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4843ea4b8ae7c9aad19f25fa973ebbf164e8732a4a28782b7e803e0df22c8d05' 
  AND token = 'fOYurekED52+U/IaX3NOO/J+4Z28DiLDBrIJEfvmOwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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