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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c154870bf1247571ec8d85df95f4d1a18169f0de7058b1e56c62e81ee2f4aee' 
  AND token = 'tz0JXHMfe2ElF9E4scjkCxIYJglH+/b7AP1K9Z5LUi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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