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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195ba93b68eb79a723c8954aab8bec3df9a87869c96cc4bb6f2bd072b58e6e9c' 
  AND token = 'c4GHxmlLLtdLtcRW8sV1oelnMMNrM94Gbgqsw5b+geM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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