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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097da5ef55fccef6ac371cb18a2cd57d40ffdcd37c2ee8fd3f4b4502fe6dcd5e' 
  AND token = 'vtF8q4zsek0O7bT/VKTgsOaFWjUcDMSi0NxChvGe8rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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