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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd2ef2113c10a248da5f9cd57f71c8f637f312b86307e9d2715aca514c9bdb4' 
  AND token = 'V6juoT8nyGZmykyhQ/BA5WRsWIdAZyV2I5ouzyknqaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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