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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7907a8465869a77e78822437fe9f73435f079d9308d90e00120120d8e2929f15' 
  AND token = 'qtOaEshtZ0DEMYmR6giw162E0J/l0tpskjw+JuklIe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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