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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a8a12694bc4983506070c913894dd23bc884eb107c7c34e91f85c15a8bb3f9' 
  AND token = '5oxK3jNh/Kdx1ymATTElkvzP2UPasWyMbOvGHiTIGDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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