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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922b0597bc98b07851af5f71b6c7044dc03ff3b1834f48bed77e384d5b2e32a2' 
  AND token = '7TuUabmdp7oxD3taTle26Af2ykEz7tC0LjG1EGgh/bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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