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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7192477a39c1a912857d99a06fdf8905d83fd6ae6ec7544352a16bb8c52ce32' 
  AND token = '9J34AGFwpPrIqiz2gfhNQIEdxyCo/DDtlImqVcnM3yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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