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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88e0c8f0ff5982e19fa3ec6624657b238afdcc3b6c938eaf5d28d6ce5892d84' 
  AND token = 'bER33BiE01gELoYNHoGfpnkWhPEscCOqwvMuLuY5iDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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