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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6af9d6bb5856e36448072a78e0300130d088678540109f02aded638a4984f9' 
  AND token = 'hxa2NHZlQ8Z0KPyf0t6Bf3gWL4PyHUc2a+WkADsfQqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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