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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d710d8a6f5f3a0c62b8306891e805fa01c38f4b45a9d2b46f573c9792a575e4' 
  AND token = 'b2nW9WoAf+3X+jlfebLm+FDDdIkyJQve+14mRQ3XVxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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