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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd3fdd1f12c2d8f4bdc4701abc4dfeec3b38216b616a7f158d35ac5aa0617bf' 
  AND token = '1oOxh+GjvVD5YQjdM+CBy7CTN1YQvti6KBxNt3cObxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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