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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910a8b5aa86bcb2efc57d50a557c1097c82dff0b4b7ed34b5be699fd4e7460b6' 
  AND token = '/6RBSHNhWW5oPYEO8jqCIDjaIzTyHHbTlr8COQqw3ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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