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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba5ba2d891778084d4e8a5caaff16abba9c2fa7ab4bd7cfe2b99e712a8ae8a1' 
  AND token = 'qa3lI9FQx4moi30bqTjkT7OR/WfHeDmsmvsOBfqTjTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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