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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e940edd9d15d0d36de32b09376e423f94f91465317571b5808af20a67cf0fd' 
  AND token = 'CZA2sKioHz31vDi9mcmmZTrj6sD13ULHBwn+oacjAS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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