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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1a97731dc133cce124b235d7ba4c23fd5807b0c888e55c5b7d97aa7e1dd385' 
  AND token = 'ae61/exoXR3yDwrhIKyreBs/CFkWiavUC+aiXk/ckuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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