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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb11f6b4707855b6a849f3a9e1c38c28cb7bcfa264d8b1c3589bac09b3d7e52' 
  AND token = 'g8E0/7XPE99kfRZq1W3gq4MCxlAeVYqlP9NVu04Q36k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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