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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16df1096b5f064a7bd91ca28c307429de3a264fabaedf0a67709f8ed3376173b' 
  AND token = 't6IcI6bK8081pIWKZH6RB5gmdLYF11zY3w8J3uV2C2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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