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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f7c00c4ff6942b878bc3802a1da55ec98740af4444b5992fb86505d173a258' 
  AND token = 'i7OX0FN4kAcrez2lA5n2dWC5/Ekj8Zrj7hGrJPGwkc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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