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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8fd3c8c8dc890546385cce8be2cf4b1996fca7ef7b587618c1bb00fa4b9531' 
  AND token = 'TMLwsQe0McVCY02ptBac54t7ZtDwjDwmHbUU6KfxCso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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