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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1136dbce19116f1bacaa48569d0e901f146973fdba896e0ef365c872ac0e741e' 
  AND token = 'E69gt3OuwGF/yKGJJi5zClF8eAx2Y8x9kGa5o0AJ5fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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