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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3755b69b3f3f7131eba70a2ee137d6be7fb18536d956f8c1af4884ee9c0cbd2b' 
  AND token = '4JwVGOiLEGafKfPDBr5pVZApCXK57pjaU955DVa8g6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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