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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6696e867e81d35c6bf1142d5138daf2ec1197e18a6ea247e33999d8a8ebf60de' 
  AND token = 'm6DNZHM2fbL5uBpGydIitpm59dVXWXzKtUvfDdpef4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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