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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7a67e1b59ca5fa5f08d91d93243595ee2dc69195fdfa191eee7fa91226943b' 
  AND token = 'Fi5eyDsKB39d5R3RKycui5lERIJ7zX6oS/COKCI84zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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