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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85e37862e4cee2f2b3ee6ef37d322889c2b1694e9f739ed5372450e09dce191' 
  AND token = 'NLMx6ib3YOuvjeM+pC2YueDOYrT8VPkk2C0hYun+s+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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