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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31693d419131bb9e4fd4aa8b38e922ae9d2edb6ccf98fa27f1c1726733e306d9' 
  AND token = 'xSUaS3d018Pl0BSYRGDhaGNDwBbZHF0TIcyqXxwX444=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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