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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75a34fe0ec257140d42d80ad59169b90c34323486bd7d57414a563316e6fb47' 
  AND token = 'c9SwqWlkLZkEH/YEeTHR2EtAuoXV0EmXobYJ+HTm7P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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